Gwyneth Paltrow and her family had a lot to celebrate over the weekend. Not only was it Mother's Day on Sunday, but it was also her daughter Apple Martin's 13th birthday. Gwyneth reunited with ex-husband Chris Martin and the two took Apple and her brother, Moses, to the new Museum of Ice Cream in LA. The Goop founder shared an adorable Boomerang video of their adventure on Instagram, writing, "Best Apple's birthday/Mother's Day EVER at the @museumoficecream 🍦🎂🍏@autumncomm SO FUN #goopgo #dtla."